ISBN: 9781236425577

RareBooksClub. Paperback. New. This item is printed on demand. Paperback. 82 pages. Dimensions: 9.7in. x 7.4in. x 0.2in.This historic book may have numerous typos and missing text. Purc… More...

RareBooksClub. Paperback. New. This item is printed on demand. Paperback. 82 pages. Dimensions: 9.7in. x 7.4in. x 0.2in.This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1913 Excerpt: . . . and General Manager white. This will greatly facilitate handling and filing. Tinting can be further employed with advantage in each department, for instance, each agreement and hire form used for a different purpose is differently tinted. An apparently small point but of great value upon occasion and always useful when reprints are required, is to have printed on all forms and papers, in an inconspicuous position, the distinguishing letter and number of the form, the number ordered, and the date, for example: --E 5610, 0001212. This will be noticed on several of the forms illustrated in this and following chapters. The Stationery Clerk also has charge of stamps, and there is a proper accounting system for these. In his charge are also the registers recording incoming and outgoing letters, and the names of persons to whom they have been referred by the General Manager. CHAPTER VIII. Part L--THE GENERATING STATION. Special Qualifications Of The Generating Engineer--General Organisation--Clerical Staff--Stores And Costing--Systems Of Remuneration---discipline And Control. Part II. --THE MAINS, METERS AND PUBLIC LIGHTING DEPARTMENT. Special Qualifications Of The Mains Engineer--General OrganIsation--Uniforms--Meters Department--Testing And Repairs--Installation Department--Mains Department--DistribuTion Network--Substations--Repairs And MaintenancePublic Lighting---Emergency Attendants--Disconnection Of Supply--Departmental Costs--Electric Vehicles. Part I. --The Generating Station. Special Qualifications Of The Generating Engineer. --In order to manage the Generating Station successfully, a greater amount of engineering skill and ability and less experience in commercialism is required than in any other department of the undertaking. The Generating Engineer mus. . . This item ships from La Vergne,TN., RareBooksClub, RareBooksClub. Paperback. New. This item is printed on demand. Paperback. 62 pages. Dimensions: 9.7in. x 7.4in. x 0.1in.This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1913 Excerpt: . . . unreliable from an insulation point of view. Slate should not be used for voltages higher than a few hundred unless the conductors passing through or supported by it are very thoroughly insulated. For switchboard work slate is very useful for installations where polished marble would quickly become discoloured. For such purposes it is usual to give the slate a black finish, which is obtained by two or more coats of a black baking varnish polished by hand rubbing. Where good appearance is not essential, slate should be treated in the way described for marble. Stone. Under this class can be placed soap stone, talc, etc. , and the manufactured substances, such as lavite and artificial stones. Soap stone is used to some extent for high voltage mountings, and is of high dielectric strength, free from metallic veins, and easily drilled and worked. On account of its high price artificial stones are largely used as substitutes. None of these, however, are as satisfactory, being very porous and hygroscopic. Lavite, steatite, and other similar materials are largely used as small bushings, and while brittle, usually have very high dielectric strength. Porcelain. Porcelain occupies a unique position among insulating materials on account of its non-combustible and high insulating properties, and because it is hard and very durable. It is prepared from special clays, which are vitrified by baking at a very high temperature, and the various qualities or grades of porcelain differ mainly according to the kinds, or proportions, of the various clays used, and on the baking temperature. The porcelain used for high tension insulating purposes consists principally of the best china clay (Kaolin) and the more plastic potters clay, with an admixture of flint to add toughness and . . . This item ships from La Vergne,TN., RareBooksClub<

ISBN: 9781236425577

RareBooksClub. Paperback. New. This item is printed on demand. Paperback. 92 pages. Dimensions: 9.7in. x 7.4in. x 0.2in.This historic book may have numerous typos and missing text. Purc… More...

RareBooksClub. Paperback. New. This item is printed on demand. Paperback. 92 pages. Dimensions: 9.7in. x 7.4in. x 0.2in.This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1913 Excerpt: . . . of power transmitted. (C) Same power loss in conductors (losses due to leakage or capacity of lines are neglected). (D) Same insulation used on both systems. This last condition is practically equivalent to stating that the maximum value of the voltage shall be the same. It is proposed to consider the following four conditions: (a) Same maximum pressure above ground; the directcurrent voltage being V2 times the alternating-current voltage (sine wave assumed). Ea 1 Ratio (1) where E and Ea stand respectively for the continuous and alternating voltages to ground. (See Figs. 48 and 49. ) Fig. 48. Fig. 49. Figs. 48 and 49. --Comparison of voltages on direct-current and three-phase systems. (b) Same as (a); but direct-current voltage double the alternating voltage. (c) Same-pressure between wires; the allowable direct-current pressure being V2 times the alternating-current pressure. yZEn 1. E V2 (d) Same as (c); but direct-current pressure double the alternating-current pressure. V3Ea 1 Ea 1--or ratio (4) To satisfy the condition of equal total power, the equation is, 2 EXl 3EaIa cos 0 (5) and for equal line losses, 2PR 3PaRa (6) where I is the current per conductor in the direct-current transmission, and R the resistance per mile of single conductor; while Ia and Ra are the corresponding quantities for the three-phase transmission. In either system the total weight (and cost) of the conductors. number of conductors, . , is proportional to resistance of each conductor whlch Slves the relation, Cost of conductors, direct-current system 2Ra Cost of conductors, three-phase system--ZR but Ra can be expressed in terms of R thus: By (6) and by (5) 42 which, when put for 72 in formula (8), gives, 3ff2 cos2 OXR 2E2 Thus the equation given by (7). . . This item ships from La Vergne,TN., RareBooksClub, RareBooksClub. Paperback. New. This item is printed on demand. Paperback. 62 pages. Dimensions: 9.7in. x 7.4in. x 0.1in.This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1913 Excerpt: . . . unreliable from an insulation point of view. Slate should not be used for voltages higher than a few hundred unless the conductors passing through or supported by it are very thoroughly insulated. For switchboard work slate is very useful for installations where polished marble would quickly become discoloured. For such purposes it is usual to give the slate a black finish, which is obtained by two or more coats of a black baking varnish polished by hand rubbing. Where good appearance is not essential, slate should be treated in the way described for marble. Stone. Under this class can be placed soap stone, talc, etc. , and the manufactured substances, such as lavite and artificial stones. Soap stone is used to some extent for high voltage mountings, and is of high dielectric strength, free from metallic veins, and easily drilled and worked. On account of its high price artificial stones are largely used as substitutes. None of these, however, are as satisfactory, being very porous and hygroscopic. Lavite, steatite, and other similar materials are largely used as small bushings, and while brittle, usually have very high dielectric strength. Porcelain. Porcelain occupies a unique position among insulating materials on account of its non-combustible and high insulating properties, and because it is hard and very durable. It is prepared from special clays, which are vitrified by baking at a very high temperature, and the various qualities or grades of porcelain differ mainly according to the kinds, or proportions, of the various clays used, and on the baking temperature. The porcelain used for high tension insulating purposes consists principally of the best china clay (Kaolin) and the more plastic potters clay, with an admixture of flint to add toughness and . . . This item ships from La Vergne,TN., RareBooksClub<

ISBN: 9781236425577

RareBooksClub. Paperback. New. This item is printed on demand. Paperback. 62 pages. Dimensions: 9.7in. x 7.4in. x 0.1in.This historic book may have numerous typos and missing text. Purc… More...

RareBooksClub. Paperback. New. This item is printed on demand. Paperback. 62 pages. Dimensions: 9.7in. x 7.4in. x 0.1in.This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1913 Excerpt: . . . unreliable from an insulation point of view. Slate should not be used for voltages higher than a few hundred unless the conductors passing through or supported by it are very thoroughly insulated. For switchboard work slate is very useful for installations where polished marble would quickly become discoloured. For such purposes it is usual to give the slate a black finish, which is obtained by two or more coats of a black baking varnish polished by hand rubbing. Where good appearance is not essential, slate should be treated in the way described for marble. Stone. Under this class can be placed soap stone, talc, etc. , and the manufactured substances, such as lavite and artificial stones. Soap stone is used to some extent for high voltage mountings, and is of high dielectric strength, free from metallic veins, and easily drilled and worked. On account of its high price artificial stones are largely used as substitutes. None of these, however, are as satisfactory, being very porous and hygroscopic. Lavite, steatite, and other similar materials are largely used as small bushings, and while brittle, usually have very high dielectric strength. Porcelain. Porcelain occupies a unique position among insulating materials on account of its non-combustible and high insulating properties, and because it is hard and very durable. It is prepared from special clays, which are vitrified by baking at a very high temperature, and the various qualities or grades of porcelain differ mainly according to the kinds, or proportions, of the various clays used, and on the baking temperature. The porcelain used for high tension insulating purposes consists principally of the best china clay (Kaolin) and the more plastic potters clay, with an admixture of flint to add toughness and . . . This item ships from La Vergne,TN., RareBooksClub<